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Arminas Butkus +370 5 219 4884
AgGaSe2 crystals
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AgGaSe2 crystals

Main features


  • Excellent properties across the transmission range from 0,73 to 18 μm
  • Low optical absorption and scattering
  • High FOM (figure-of-merit) for non-linear interactions in NIR and MIR


Application examples


  • Frequency mixing in the IR region from 4,0 to 18,3 μm
  • Second harmonic generation and up-conversion for CO2 lasers
  • Tunable OPO for solid-state lasers with efficiency up to 10%
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  • Description
  • Properties

Silver Selenogallate (AgGaSe2, AGSE) has been demonstrated to be an efficient frequency doubling crystal for infrared radiation with transmission spectrum at 0,73 μm - 18 μm and no residual e-ray absorption centered around 1800 nm. AGSE useful transmission range lying within 0,916 μm and wide phase matching provide excellent potential for OPO applications when pumped by variety of lasers. Tuning within 2,512 μm could be obtained by pumping AGSE by Ho:YLF laser at 2,05 μm.

Physical and optical properties
Chemical formula AgGaSe2
Crystal structure Tetragonal, 42m
Lattice parameters a = 5,9920 Å, c = 10,8803 Å
Optical symmetry Negative uniaxial (no >ne, λ < 804 nm ne > no)
Density 5,7 g/cm3
Mohs hardness 3-3,5
Transparency range @"0" transmittance level 0,71 - 19 μm 
Sellmeier equations @T=293 K (λ in μm) no2=6,8507 + 0,4297/(λ2 - 0,1584) - 0,00125 λ2;

ne2 = 6,6792 + 0,4598/(λ2 - 0,2122) - 0,00126 λ2
Refractive indices @10,5 μm no = 2,5917, ne = 2,5585
Thermal conductivity @T = 293 K 1 (||c) Wm-1K-1, 1,1 (⊥c) Wm-1K-1
Laser induced damage threshold >10 MW/[email protected],6 μm, 150 ns
Custom components

4Lasers does not provide standard product list. Please contact us for solutions and pricing.


Request custom